Elliott Broidy, a former top fundraiser for US President Donald Trump, suffered another legal setback on Friday in his efforts to pin the blame on Qatar for a hack of his emails, as a judge tossed out his lawsuit against a veteran United Nations diplomat.

Broidy, a businessman who held senior finance posts in Trump's 2016 presidential campaign and his inaugural committee, sued Jamal Benomar in July, claiming he orchestrated the dissemination of hacked emails to media outlets.

Benomar, a British citizen born in Morocco and a former UN special envoy for Yemen, had denied involvement and sought to get the lawsuit thrown out by asserting diplomatic immunity, a status confirmed by the Trump administration last month.